I am designing pieces for a game level which all fit together, and so they're all currently in the same .blend file. I've made 20 pieces and I now need to save each piece as its own .blend file - how can I achieve that? The only export options Blender has are for other file types.

I guess I could duplicate the file 20 times, open each one up and delete all the pieces which don't belong, but that's a terrible solution to what I think is a simple problem.